Proof?of?work
It?is?my?unit?（?Comrade）?（?ID?number：?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?）?in?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?department，?engaged?in?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?work?has?been?_?_?_?_?_?_?_?_?_?_?_?years，?hereby?certify?that。
Name?of?Institution：?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_
Day?period：?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_
（?seal）